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#include "AFBClient.h"

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#ifdef AFB
/* the callback interface for wsj1 */
static struct afb_wsj1_itf itf =
{
    .on_hangup = AFBClient::onHangup,
    .on_call = AFBClient::onCall,
    .on_event = AFBClient::onEvent
};
#endif

AFBClient::AFBClient()
{
}

bool AFBClient::init()
{
    /* get the default event loop */
    int rc = sd_event_default(&loop);
    if (rc < 0) {
        fprintf(stderr, "Connection to default event loop failed: %s\n", strerror(-rc));
        return false;
    }

#ifdef AFB
    /* connect the websocket wsj1 to the uri given by the first argument */
    wsj1 = afb_ws_client_connect_wsj1(loop, wmURI, &itf, NULL);
    if (wsj1 == NULL) {
        fprintf(stderr, "Connection to %s failed: %m\n", wmURI);
        return false;
    }
#endif

    return true;
}

void AFBClient::requestSurface(const char *label)
{
    const char functionParamName[] = "{\"drawing_name\":\"";
    char *parameter = (char *)malloc(strlen(functionParamName) + strlen(label) + 3);
    strcpy(parameter, functionParamName);
    strcat(parameter, label);
    strcat(parameter, "\"}");
    printf("requestSurface(%s): %s\n", label, parameter);
    call(wmAPI, "request_surface", parameter);
}

void AFBClient::activateSurface(const char *label)
{
    const char functionParamName[] = "{\"drawing_name\":\"";
    char *parameter = (char *)malloc(strlen(functionParamName) + strlen(label) + 3);
    strcpy(parameter, functionParamName);
    strcat(parameter, label);
    strcat(parameter, "\"}");
    printf("activateSurface(%s): %s\n", label, parameter);
    call(wmAPI, "activate_surface", parameter);
}

void AFBClient::deactivateSurface(const char *label)
{
}

void AFBClient::endDraw(const char *label)
{
}

/* called when wsj1 receives a method invocation */
void AFBClient::onCall(void *closure, afb_wsj1 *wsj1)
{
#ifdef AFB
    int rc;
    printf("ON-CALL %s/%s:\n%s\n", wmAPI, verb,
           json_object_to_json_string_ext(afb_wsj1_msg_object_j(msg),
                                          JSON_C_TO_STRING_PRETTY));
    fflush(stdout);
    rc = afb_wsj1_reply_error_s(msg, "\"unimplemented\"", NULL);
    if (rc < 0)
        fprintf(stderr, "replying failed: %m\n");
#endif
}

/* called when wsj1 receives an event */
void AFBClient::onEvent(void *closure, const char *event, afb_wsj1_msg *msg)
{
#ifdef AFB
    printf("ON-EVENT %s:\n%s\n", event,
           json_object_to_json_string_ext(afb_wsj1_msg_object_j(msg),
                                          JSON_C_TO_STRING_PRETTY));
    fflush(stdout);
#endif
}

/* called when wsj1 hangsup */
void AFBClient::onHangup(void *closure, afb_wsj1 *wsj1)
{
    printf("ON-HANGUP\n");
    fflush(stdout);
    exit(0);
}

/* called when wsj1 receives a reply */
void AFBClient::onReply(void *closure, afb_wsj1_msg *msg)
{
#ifdef AFB
    printf("ON-REPLY %s: %s\n%s\n", (char*)closure,
           afb_wsj1_msg_is_reply_ok(msg) ? "OK" : "ERROR",
           json_object_to_json_string_ext(afb_wsj1_msg_object_j(msg),
                                          JSON_C_TO_STRING_PRETTY));
    fflush(stdout);
    free(closure);
#endif
}

/* makes a call */
void AFBClient::call(const char *api, const char *verb, const char *object)
{
#ifdef AFB
    static int num = 0;
    char *key;
    int rc;

    /* allocates an id for the request */
    rc = asprintf(&key, "%d:%s/%s", ++num, api, verb);

    /* send the request */
    rc = afb_wsj1_call_s(wsj1, api, verb, object, AFBClient::onReply, key);
    if (rc < 0)
        fprintf(stderr, "calling %s/%s(%s) failed: %m\n", api, verb, object);
#endif
}

/* sends an event */
void AFBClient::event(const char *event, const char *object)
{
#ifdef AFB
    int rc;

    rc = afb_wsj1_send_event_s(wsj1, event, object);
    if (rc < 0)
        fprintf(stderr, "sending !%s(%s) failed: %m\n", event, object);
#endif
}

void AFBClient::emitSignalOrCall(const char *api, const char *verb, const char *object)
{
    if (object == NULL || object[0] == 0)
        object = "null";
    if (api[0] == '!' && api[1] == 0)
        event(verb, object);
    else
        call(api, verb, object);
}